MODELS

B4-23

• –55°C to +85° C operation

• 9 to 16 or 16 to 36 VDC input

• Fully isolated

• Opto-coupler feedback

• Fixed frequency, 250 kHz typical

• Topology – Push-Pull Forward

• 50 V for 50 ms transient protection

• Inhibit function

• Indefinite short circuit protection

• Up to 79% efficiency

TRIPLE

+5 & ±12

+5 & ±15

DESCRIPTION

Interpoint’s MTO Series™ of DC/DC converters delivers 15 watts of

output power with three output voltages and a choice of two input

voltage ranges. The MTO Series converters are packaged in

hermetically sealed metal cases and operate at full load over a case

temperature range of -55°C to +85°C (measured at the base plate

of the converter).

The push-pull forward topology coupled with pulse-width modulation

minimizes output noise and maintains good regulation. Nominal

switching frequency is 250 kHz. Although an internal input filter

reduces input ripple current, for applications requiring conformance

to MIL-STD-461C, CE03, use the MTO in conjunction with

Interpoint’s FM-461 EMI filter.

Operating at maximum ratings may require removing self-generated

heat. To increase heat dissipation, heat conducting material can be

used in contact with the converter’s base plate. Interpoint’s Thermal

Mounting Pad (TMP), model TMP-002, is designed for use with the

MTO converter.

An inhibit terminal, pin 8, provides shut-down and start-up control.

Applying a logic low (<0.8 V) will disable the output of the converter

reducing input current to 8 mA, typical. Leaving the terminal uncon-

nected or connecting it to Vin will enable the converter. The inhibit

pin has an open circuit voltage of approximately 10 volts.

Soft-start provides a controlled 20 milliseconds turn-on to minimize

inrush current and reduce overshoot at initial start-up or when inhibit

is released.

Internal current limiting circuitry protects all three outputs against

short circuits. When output power exceeds approximately 125% of

maximum output power, the output currents are limited. In addition,

separate current limiting circuitry protects each output individually.

MTO converters are packaged in hermetically sealed metal cases.

The cases are constructed of cold-rolled steel with a fused tin finish.

MTO converters can be purchased in a flanged or non-flanged case.

The flanged option provides increased heat dissipation and also

provides greater stability when mechanically secured.

MTO SERIES

15 WATT

Size (max.): Non-flanged, case F4, 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm)

Flanged, case J5, 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)

See Section B8, cases F4 and J5, for dimensions.

Weight:

53 grams typical

Screening:

Standard or ES. See Section C2 for screening options, see Section A5 for

ordering information.